What does a school crossing patrol signal when they are ready to stop pedestrians?

The school crossing patrol signals readiness to stop pedestrians by raising an arm at shoulder height. This clear gesture is easily recognizable to both children and drivers, effectively communicating that it is time for pedestrians to stop and wait for further instructions. Such a signal is crucial for ensuring the safety of children and others crossing the street, as it establishes a visual cue that directs behavior in a potentially hazardous environment.

This method of signaling is important because it is both visible and prominent, allowing it to be seen from a distance, which enhances safety. It is a standardized action that is understood by all, facilitating a smooth and safe crossing process. The other options do not provide the same level of clarity or effectiveness in signaling the need for pedestrians to stop.